Hi,
I wanted to know that how we can expose/embedd our Appian functionality/action to other application which is not of Appian ex: A Java built-in app, so the user using the application can perform an action which is build of Appian.
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you may use Appian Web API's which can be triggered from the other application
Check Embedded Interfaces
https://docs.appian.com/suite/help/24.3/Embedded_Interfaces.html
As suggested by Navajith K , creating a webApi would be my preffered choice to get an action triggered from a different application